Murphy's Law of Bolt-Loosening 

"You can heave and strain on da wrench till Doomsday and never get a stubborn bolt loosened, but then just as soon as you ask a stronger --- and probably very busy himself --- person to come and help, DAT'S when da blasted bolt actually WILL yield, either when you give a final demonstrative yank on da wrench to show da second person how supposedly stuck da bolt is, or when he himself hauls back on da wrench and said previously-cranky bolt unscrews with little effort on his part, indicating dat your OWN last tug actually HAD cracked it free after all, and so if you had 'just given it one more go' yourself, you actually COULD have gotten da bolt out on your own, without having to interrupt your now-ears-smokingly-annoyed-at-being-needlessly-called-away colleague in da first place."

I wonder if da inventor of da impact wrench had originally felt prompted to do so due to his having frequently encountered Murphy's Law of Bolt-Loosening???

Murphy's Law of Bolt-Loosening by QuacksO February 13, 2023